package com.kkw.shoppingmall.seckill.scheduled;

import com.kkw.shoppingmall.seckill.service.SeckillService;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

/**秒杀商品定时上架
 *    每天晚上3点：上架最近3天需要秒杀的商品
 *    当天00:00:00-23：59:59
 * @author Kevin
 * @date 2021-06-21
 **/
@Slf4j
@Service
public class SeckillSkuScheduled {


    @Autowired
    private SeckillService seckillService;

    @Autowired
    private RedissonClient redissonClient;

    private final String upload_lock="seckill:upload:lock";

    //todo 幂等性问题   避免定时任务部署了多台机器  所以先加个分布式锁 然后再业务代码里面加入防重复机制
    //上架过的商品不用再次上架了  幂等性问题
    @Scheduled(cron = "0 * * * * ?")
    public void uploadSeckillSkuLatest3Days(){
        //1、重复上架无需处理
        log.info("上架秒杀商品的信息");
        RLock lock = redissonClient.getLock(upload_lock);
        lock.lock(10, TimeUnit.SECONDS);
        try {
            seckillService.uploadSeckillSkuLatest3Days();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}
